/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.test.web.reactive.server;

import java.util.function.Consumer;

import org.hamcrest.Matcher;

import org.springframework.test.util.JsonPathExpectationsHelper;

/**
 * <a href="https://github.com/jayway/JsonPath">JsonPath</a> assertions.
 *
 * @author Rossen Stoyanchev
 * @see <a href="https://github.com/jayway/JsonPath">https://github.com/jayway/JsonPath</a>
 * @see JsonPathExpectationsHelper
 * @since 5.0
 */
public class JsonPathAssertions {

    private final WebTestClient.BodyContentSpec bodySpec;

    private final String content;

    private final JsonPathExpectationsHelper pathHelper;


    JsonPathAssertions(WebTestClient.BodyContentSpec spec, String content, String expression, Object... args) {
        this.bodySpec = spec;
        this.content = content;
        this.pathHelper = new JsonPathExpectationsHelper(expression, args);
    }


    /**
     * Applies {@link JsonPathExpectationsHelper#assertValue(String, Object)}.
     */
    public WebTestClient.BodyContentSpec isEqualTo(Object expectedValue) {
        this.pathHelper.assertValue(this.content, expectedValue);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#exists(String)}.
     */
    public WebTestClient.BodyContentSpec exists() {
        this.pathHelper.exists(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#doesNotExist(String)}.
     */
    public WebTestClient.BodyContentSpec doesNotExist() {
        this.pathHelper.doesNotExist(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#assertValueIsEmpty(String)}.
     */
    public WebTestClient.BodyContentSpec isEmpty() {
        this.pathHelper.assertValueIsEmpty(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#assertValueIsNotEmpty(String)}.
     */
    public WebTestClient.BodyContentSpec isNotEmpty() {
        this.pathHelper.assertValueIsNotEmpty(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#hasJsonPath}.
     *
     * @since 5.0.3
     */
    public WebTestClient.BodyContentSpec hasJsonPath() {
        this.pathHelper.hasJsonPath(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#doesNotHaveJsonPath}.
     *
     * @since 5.0.3
     */
    public WebTestClient.BodyContentSpec doesNotHaveJsonPath() {
        this.pathHelper.doesNotHaveJsonPath(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#assertValueIsBoolean(String)}.
     */
    public WebTestClient.BodyContentSpec isBoolean() {
        this.pathHelper.assertValueIsBoolean(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#assertValueIsNumber(String)}.
     */
    public WebTestClient.BodyContentSpec isNumber() {
        this.pathHelper.assertValueIsNumber(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#assertValueIsArray(String)}.
     */
    public WebTestClient.BodyContentSpec isArray() {
        this.pathHelper.assertValueIsArray(this.content);
        return this.bodySpec;
    }

    /**
     * Applies {@link JsonPathExpectationsHelper#assertValueIsMap(String)}.
     */
    public WebTestClient.BodyContentSpec isMap() {
        this.pathHelper.assertValueIsMap(this.content);
        return this.bodySpec;
    }

    /**
     * Delegates to {@link JsonPathExpectationsHelper#assertValue(String, Matcher)}.
     *
     * @since 5.1
     */
    public <T> WebTestClient.BodyContentSpec value(Matcher<T> matcher) {
        this.pathHelper.assertValue(this.content, matcher);
        return this.bodySpec;
    }

    /**
     * Delegates to {@link JsonPathExpectationsHelper#assertValue(String, Matcher, Class)}.
     *
     * @since 5.1
     */
    public <T> WebTestClient.BodyContentSpec value(Matcher<T> matcher, Class<T> targetType) {
        this.pathHelper.assertValue(this.content, matcher, targetType);
        return this.bodySpec;
    }

    /**
     * Consume the result of the JSONPath evaluation.
     *
     * @since 5.1
     */
    @SuppressWarnings("unchecked")
    public <T> WebTestClient.BodyContentSpec value(Consumer<T> consumer) {
        Object value = this.pathHelper.evaluateJsonPath(this.content);
        consumer.accept((T) value);
        return this.bodySpec;
    }

    /**
     * Consume the result of the JSONPath evaluation and provide a target class.
     *
     * @since 5.1
     */
    @SuppressWarnings("unchecked")
    public <T> WebTestClient.BodyContentSpec value(Consumer<T> consumer, Class<T> targetType) {
        Object value = this.pathHelper.evaluateJsonPath(this.content, targetType);
        consumer.accept((T) value);
        return this.bodySpec;
    }


    @Override
    public boolean equals(Object obj) {
        throw new AssertionError("Object#equals is disabled " +
                "to avoid being used in error instead of JsonPathAssertions#isEqualTo(String).");
    }

    @Override
    public int hashCode() {
        return super.hashCode();
    }

}
